Hydrophobic and Environment-resistant Properties of SiO2/TiO2/SiO2-TiO2 Multilayer Antireflective Films in Wide Solar Spectra Range
(2.Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, China 518057)
(3.Harbin Institute of Technology Shenzhen Graduate School, Shenzhen , China 518055)
【Abstract】In the help of coatings optimization design using TFCcal program, wide spectrum antireflective SiO2/TiO2/SiO2-TiO2 multilayer films with thickness precisely controlled were prepared on low iron glass using sol gel process and Czochralski method. The thickness of above layers were separately set as 80.9 nm (SiO2-TiO2, inner layer), 125.0 nm (TiO2, inter-layer) and 95.5 nm (SiO2, outer layer) according to the results of calculation. A high-transmittance and highly hydrophobic film was prepared by Czochralski method combined with methyl triethoxysilane (MTES) SiO2 modified base-catalyzed sol. The average optical transmittance could reach 97.03% in the wavelength range of 400 – 700 nm. After annealing treatment, the surface water contact angles were almost around 131.5°. Furthermore, the optical transmittance only reduced 0.143% after aging for two months, showing that the prepared SiO2/TiO2/SiO2-TiO2 multilayer antireflective films had excellent hydrophobic and environment resistant properties.
【Keywords】 antireflective films; hydrophobic; environment resistant; wide spectrum;
DEUBENER J, HELSCH G, MOISEEV A, et al. Glasses for solar energy conversion systems. J. Eur. Ceram. Soc. 2009, 29: 1203–1210.
YE H P, ZHANG X X, ZHANG Y L, et al. Preparation of antireflective coatings with high transmittance and enhanced abrasion-resistance by a base/acid two-step catalyzed Sol-Gel process. Solar Energy Mater. Solar Cells, 2011, 95(8): 2347–2351.
VICENTE G S, BAYON R, GERMAN N, et al. Long-term durability of Sol-Gel porous coatings for solar glass covers. Thin Solid Films, 2009, 517(10): 3157–3160.
HELSCH G, MÖS A, DEUBENER J, et al. Thermal resistance of nanoporous antireflective coatings on silica glass for solar tower receivers. Solar Energy Mater. Solar Cells, 2010, 94(12): 2191–2196.
PRADO R, BEOBIDE G, MARCAIDE A, et al. Development of multifunctional Sol-Gel coatings: anti-reflection coatings with enhanced self-cleaning capacity. Solar Energy Mater. Solar Cells, 2010, 94(6): 1081–1088.
WANG JIAN-WU, BAI YU-CHEN, YAO WEI, et al. Preparation and investigation of SiO2/TiO2 antireflective coatings with self-cleaning and scratch-resistant properties. Journal of Inorganic Materials, 2011, 26(7): 769–773.
YAN L H, CHI F T, JIANG X B, et al. Preparation of hydro-oleophobic silica antireflective coating. Journal of Inorganic Materials, 2007, 22(6): 1247–1250.
LI X, SHEN J. A Scratch-resistant and hydrophobic broadband antireflective coating by Sol-Gel method. Thin Solid Films, 2011, 519(19): 6236–6240.
XIAO B, ZHANG Y L, ZHANG X X, et al. Focus on moisture-resistance and hydrophobicity of SiO2 antireflective film improved by poly(isopropylene oxide)glycerolether. J. Sol-Gel Sci. Technol. , 2011, 60(1): 11–16.
LEI M A, LI F S, SAKAE T, et al. Cost-effective nanoporous SiO2-TiO2 coatings on glass substrates with antireflective and self-cleaning properties. Appl. Energy, 2013, 112: 1198–1205.
YE L, ZHANG Y, ZHANG X, et al. Sol-Gel preparation of SiO2/TiO2/SiO2-TiO2 broadband antireflective coating for solar cell cover glass. Solar Energy Materials and Solar Cells, 2013, 111: 160–164.
TANG J F, GU P F, LIU X, et al. Modern optical thin film technology. Hangzhou: Zhejiang University Press, 2006(in Chinese).
NOSTELL P, ROOSA A, KARLSSON B. Optical and mechanical properties of Sol-Gel antireflective films for solar energy applications. Thin Solid Films. 1999, 351: 170–175.
CHANG Y C, MEI G H, CHANG T W, et al. Design and fabrication of a nanostructured surface combining antireflective and enhanced-hydrophobic effects. Nanotechnology, 2007, 18(28): 285 303.
BARTHLOTT W, NEINHUIS C. Purity of the sacred lotus, or escape from contamination in biological surfaces. Planta, 1997, 202(1): 1–8.
ZHANG X X, CAO C R, XIAO B, et al. Preparation and characterization of polyvinyl butyral/silica hybrid antire flective coating: effect of PVB on moisture-resistance and hydrophobicitye. Sol-Gel Sci. Technol, 2010, 53(1): 79–84.
WADA M, KAMIYA K, NASU H. X-ray diffraction analysis of SiO2 gel prepared from monomethyl-tri-ethoxysilane by the Sol-Gel method. Phys. Chem. Glasses, 2002, 33(2): 56–60.